Prevent your computer from going to sleep
If you have problems with your PC locking or going to sleep, caffeine will keep it awake. It works by simulating a keypress once every 59 seconds, so your machine thinks you're still working at the keyboard, so won't lock the screen or activate the screensaver.
Caffeine C8H10N4O2 CID 2519 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety. Caffeinated water products range in caffeine content, containing 34–125 mg. Plus, they're sold in cans or bottles that range in size from 12–16.9 ounces (355–500 ml).
The icon is shown above - it's the leftmost one in the task tray, and this is all you see. Screaming frog seo spider 12 650. Double-clicking the icon empties the coffee pot (that's what the icon is) and temporarily disables the program. Double-clicking it again refills the pot, and will keep your machine awake.
By default the app starts enabled, and works every 59 seconds. There are some command line switches you can use to alter this behaviour:
xx- where xx is a number which sets the number of seconds between simulated keypresses. This must be the first text on the commandline-startoff- application starts disabled.-exitafter:xx- application will terminate after xx minutes-activefor:xx- application will become inactive after xx minutes-inactivefor:xx- application will become active after xx minutes-appexit- terminates current running instance of application-appon- makes the current running instance of the application active-appoff- makes the current running instance of the application inactive-apptoggle- toggles the running state of the current running instance of the application-apptoggleshowdlg- toggles the running state, and shows dialog-replace- closes the current running instance, replacing it-noicon- does not show a task tray icon-useshift- simulate the shift key instead of F15-showdlg- shows a dialog indicating whether caffeine is active-ontaskbar- show a task bar button (use with -showdlg)-allowss- prevent sleep, but allow the screensaver to start-key:xx- simulate using virtual key code xx
Note: the codes on the linked page are in Hex, convert them to decimal for use with this parameter-keypress- simulate a full key press, not just a key up event-oldicons- use more colourful tray icons-darkicons- use icons which work better for dark-on-light colour schemes-watchwindow:xx- active only when a window with xx in the title is found
Compatibility
Caffeine works by simulating an F15 key up event every 59 seconds. Of all the key presses available, F15 is probably the least intrusive, and least likely to interfere with your work.
Good five nights at freddys. However, Caffeine might interfere with some apps:
- PowerPoint uses the F15 keypress to pause video in a slide
- Google Docs/Sheets
- Smartsheet
- Terminal emulation, e.g. Putty
If you think any of these might cause you a problem, set the -useshift command line parameter.
Video
Caffeine user humancar2n has put together a short YouTube video showing how the app works.
Mac version
Do you need this functionality on your Mac? Lighthead Software have written a separate app, also named Caffeine, which can help you out.
Versions
Mac scanner icon. v1.81 - May 2020
Bug with the -watchwindow command line fixed
v1.80 - January 2020
v1.64 - September 2017
Option for old icons added, 'cos not everyone likes the new ones
v1.63 - February 2017
Icons updated slightly to show up better on a white background.
v1.62 - April 2016
New icons, designed by Rubén Gómez Radioboy
Paint code 3 4 5 x 4. v1.61 - October 2015
Fixed bug with app not going active/inactive correctly when a timed period elapsedNhl 13 keygen download. v1.60 - July 2013
New command line options:
-allowss-ontaskbar-apptoggleshowdlg-key:xx-keypress
Added menu items to go Active/Inactive Diskwarrior v5 2 recovery maker v1 3.
Caffeinated 1 1 72
Type in About box corrected
-apptoggle will re-show the dialog if it was originally shown
v1.50 - November 2010
New command line options:
-inactivefor-showdlg-apptoggle
Simulated keypress changed from right context menu key to F15 as this is likely to be even less intrusive.
v1.40 - July 2009
New command line options:
-replace-noicon-useshift
Hovering over the tray icon now shows the status of the app
v1.35 - May 2009
Simulated keypress changed from shift to the right context menu key (at the suggestion of Kevin Kleinfelter) as this is likely to be less intrusive.
v1.30 - February 2009
Command line switches added to terminate the app after x minutes, disable the app after x minutes, and enable or disable the currently running instance of the app
v1.20 - March 2008
Command line switches added to set the interval and to start disabled
Download Caffeine (x86 and x64)
If you're used to drinking caffeinated beverages every day — whether in the form of coffees, sodas, energy drinks, or teas — you might experience some bizarrecaffeine withdrawal symptoms, if you decide to suddenly cut back. These can range from physical symptoms, to mental and emotional ones. And it can all be pretty uncomfortable until your body adjusts.
Of course, a lack of caffeine won't impact everyone in the same way. 'Usually someone needs to be taking at least 100 mg per day before stopping to experience symptoms,' Dr. David Gatz, of Mercy Medical Center, tells Bustle. Whether you forgot your usual morning cup, or are cutting back on purpose, you might feel a difference within 12 to 24 hours, Dr. Gatz says, with more intense withdrawal symptoms a day or two later.
If you're trying to rely less on things like coffee and soda in order to get through the day, there are ways to get through the process with suffering too much. As Dr. Gatz says, 'Individuals wishing to reduce their caffeine intake should consider doing so gradually if they are using large amounts of caffeine on daily basis.'
You might, for example, go down from four cups a day to three, switch to decaf, or water-down your coffee until you don't need it anymore. While it may not be fun at first, there are plenty of ways to get through the caffeine withdrawal symptoms listed below, and come out the other side.
'Your brain has receptors that caffeine directly affects,' Dr. Thanu Jey, clinic director at Yorkville Sports Medicine Clinic, tells Bustle. 'These receptors are for neurotransmitters that can induce feelings such as irritability, nervousness, anxiety, etc.'
Your brain can get used to operating on a daily intake of caffeine. But 'when you remove caffeine from your system, these effects increase temporarily,' Dr. Jey says, 'causing these withdrawal symptoms.' So don't be surprised if everyone and everything grates on your last nerve, until you adjust.
'Brain fog is a noted symptom of caffeine withdrawal, which is increased difficulty [in following] conversations, difficulty thinking clearly, and even difficulty staying on task,' Scott-Hudson says. You might, for example, feel spaced out at work, or have a hard time paying attention during a phone call.
These symptoms will go away in a few days, but it can be a rough adjustment in the meantime. To feel better, try swapping every other cup of regular coffee with decaf, so you aren't going completely cold turkey. And try to avoid having caffeine later in the day.
Believe it or not, cutting back on caffeine can temporarily impact your ability to make decisions. And that's thanks to the fact caffeine increases your levels of dopamine. As Bart Wolbers, researcher at Nature Builds Health, tells Bustle, 'You don't only need dopamine to be motivated, happy, and assertive, but also for abstract and outside-the-box thinking.'
You might notice that, in lowering your caffeine intake, you'll have a tough time seeing the big picture, Wolbers says, or coming up with creative solutions. Don't worry, though, as it isn't a problem that'll stick around.
Weirdly, some people might even experience flu-like symptoms while going through caffeine withdrawal, Dr. Gatz says, which can include the likes of fatigue, headaches, and muscle aches. Headaches, in particular, are one of the more common side effects of caffeine withdrawal, with about half of people experiencing them.
Again, it depends on things like how much caffeine you were consuming to begin with, Dr. Gatz says. If you're used to having several large coffees a day, and then go down to zero, you will probably feel worse than someone who only ever had one.
Caffeinated 1 1 7 X 3 5
'In severe cases,' Dr. Gatz says, 'symptoms can last up to nine days.' You can make it easier on yourself, though, by slowly weaning yourself off your usual caffeine intake. It'll be much easier to cut back if you don't have headaches, anxiety, and digestive issues, so be kind to yourself.
